Winterizing Your Home: Room by Room

Walk through your basement, crawl space, and garage looking for bare water supply pipes — especially those running along exterior walls or in unheated spaces. Fit foam pipe sleeves snugly over each exposed pipe, securing ends with duct tape. For areas that drop well below freezing, consider heat tape rated for indoor/outdoor use as an added layer of protection.

Locate your main water shutoff valve and confirm it operates freely. Knowing where it is can save significant time and water damage if a pipe fails.

Check every exterior window and door for drafts. Apply silicone caulk around window frames where they meet the exterior siding or interior drywall. Replace cracked or compressed weatherstripping on door jambs, and install or refresh door sweeps at the bottom of exterior doors. For older single-pane windows, a window insulation film kit can provide a meaningful additional thermal barrier at low cost.

Pay special attention to electrical outlets on exterior walls — foam outlet gaskets (installed behind the cover plate) are an inexpensive and often overlooked fix.

Climb into your attic with a flashlight and measure the depth of existing insulation. The U.S. Department of Energy recommends R-38 to R-60 for attics in most northern climate zones, which translates to roughly 10–16 inches of fiberglass batt or blown insulation. If your attic floor shows joists above the insulation level, you likely need more.

Before adding insulation, seal any visible gaps around light fixtures, plumbing penetrations, and the attic hatch using fire-rated caulk or foam. These air bypasses allow warm air to escape and can cause ice dams to form on the roof.

Remove all leaves, twigs, and debris from gutters before the first hard freeze. Packed debris holds moisture and, once frozen, adds significant weight that can pull gutters away from the fascia. Use a gutter scoop, then flush each run with a garden hose to confirm downspouts are flowing freely.

Extend downspout outlets at least 4–6 feet from the foundation to direct meltwater away from the house. Pooling water near the foundation can freeze and cause cracking over repeated freeze-thaw cycles.

Replace the furnace or heat pump filter before the heating season begins — a clogged filter forces the system to work harder and can shorten equipment life. If your furnace, boiler, or heat pump has not been professionally inspected in the past year, schedule a tune-up now before technicians become fully booked once cold weather hits.

Bleed radiators on hot-water heating systems if you hear knocking or notice uneven heat. Check that all supply and return vents are unobstructed by furniture or rugs.

Inspect crawl space vents — in most climates, these should be closed or insulated for winter to reduce cold air intrusion under the floor. Check the crawl space vapor barrier (a plastic sheet on the ground) for tears or gaps and patch as needed to limit moisture migration.

In the basement, look for cracks in the foundation walls and seal minor cracks with hydraulic cement or masonry caulk before freeze-thaw cycles worsen them. Ensure the sump pump is operational and that the discharge line will not freeze solid during deep cold.

Test every smoke detector and carbon monoxide detector in the home. Replace batteries in units that are not hardwired, and replace any detector that is more than 10 years old (smoke) or 5–7 years old (CO). Winter brings increased furnace operation, fireplace use, and space heater risks — functional detectors are essential.

Inspect your fire extinguisher's pressure gauge and confirm it is accessible. If you use a wood-burning fireplace or stove, have the chimney swept and inspected by a certified chimney sweep before the first use of the season.